Improvement in blackboard attachments



HQ B. MARSHALL. BLAGKBOARD ATTACIIMENT.

@10,159,649I Paten-tea N0v.9,1a7s.

Q ln @we fak N PErERS, PMOTO-LITNDGRAPHER. WASH NGTON n C :UNITED STATESPATENT OFFICE.

HORACE B. MARSHALL, OF KINGSTON, ASSIGNOR TO GEORGE H. ALLEN, OF

" AYER, MASSACHUSETTS.

IMPROVEMENT IN BLACKBARD ATTACHMENTS.

Specification forming part of Letters Patent N0. 169,649, dated November9, 1875; application iiled" April 13, 1875.

To all whom it may concern:

Beit known that I, HORACE B. MARSHALL, of Kingston, county of Plymouthand State of Massachusetts, have invented certain Improvements in anAttachment to a Blackboard or Blackboard-Trough, of which the followingis a specification:

The invention consists in the application. of Wire-netting'or netting ofany substance (used for the purposes herein set forth) to black` boardsor blackboard-troughs, as a receiver for crayons or any other. substanceused for marking upon blackboards; also, as a receiver for erasers, andfor cleaning the same.

The object of the invention isto providea more convenient receptacle forcrayons, in4

which they Will be separated from the dust which usually collects inconsiderable quantities in the trough of a blackboard. Another object ofthe invention is to prevent the dust arising from the use of crayonsupon blackboards from being scattered upon the door of .the room, orthrough the atmosphere of the room, to be inhaled by the occupantsthereof.

'A further object of the invention is to serve 'as a receiver forerasers, and a cleaner for the same.

A view of the -crayon-receiver and erasercleaner is shown in thedrawings which accompany this specication. I describe the drawings asfollows:

In Figure 1, A represents a blackboard; B, the wirejlnetting; D, ablackboard-trough; and F E, buttons attached to the blackboard andfitting into button-h oles in the wire-nettin g.

In Fig. 2 there is substantially the same view of the blackboard andattachments, and the parts are respectively designated by the sameletters as in Fig. l', with this addition, that in Fig. 2 E represents amovable receptacle'or trough in process of being removed from thestationary trough I). Fig. 2 also represents the Wire-nettin g B asturned back to admit of the removal of the trough E.

The Wire-netting B, as represented in Figs. 1 and 2, is concave, thisbeing the most conthe butts G G. B might be attached directly by buttsor otherwise to the trough D, or even to the movable trough E. TheWire-nettingN or crayon-receiver B is held in place by the buttons F F.The crayons or erasers are placed on the receiver B. The dust caused bymarking, or by the erasure of marks upon the blackboard A, falls throughthe meshes of the receiver B, and is collected in the trough D, or inthe movable trough E, if it is used.-

The blackboard eraser being illed with dust from constant use, by beingrubbed along the meshes of the receiver B is i'reed from dust, whichpasses down into the receptacle beneath.

In Fig. 2 the crayon-receiver B is represented as turned back, for thepurpose ot' re moving the movable trough E.

Other substances and devices besides Wirenetting might be used for thecrayon-receiver and eraser-cleaner, such as metal or Wood, perforated,or pieces of Wood or metal laid transversely across the trough D;but.wirenetting being cheap and durable, is preferable to anything elsefor the purposes for which the receiver is designed.

I do not claim the trough D, as in various forms itis in universal use.I am not part-icular to claim the movable trough E, although as anattachment to a blackboard-trough I think it is new.

What I claim, and desire to secure by Letters Patent, is-

In combination with ablackboard-trough the netting B, to form a receiverfor crayons and a cleaner for erasers, substantially as described, andfor the purpose set forth.

HORACE B. MARSHALL.

